Sewage disposal.



L. T. LEET.

SEWAGE DISPOSAL.

APPLICATION FILED NOV. 17, 1909. RENEWED APR. 3, 1913.

1,079,569. Patented Nov. 25, 1913. 1

WITNESSES: I @JW ZylmTLeei,

AITORMEY To all whom it may concern:

UNITED STATES rA'rENT OFFICE.-

LYN N T. LEET, OF READING, PENNSYLVANIA, ASSIGNOR '1O WATER & SEWAGEPUBI- FIOATION COMPANY, OF NEW YORK, N. Y., A

CORPORATION OF DELAWARE.

SEWAGE DISPOSAL.

v Patented Nov. 25, 1913.

Application filed November 17, 1909, Serial No. 528,614. Renewed April3, 1913. Serial No. 758,714.

Be it known that I,- LYNN T. Lanna citizen of Canada, and resident ofReadlng, 1n the county of Berks and State of Pennsylvania, have inventedcertain new and useful Improvements in Sewage Disposal, of which thefollowing is a specificatlon.

This invention relates to the purification of sewage and has in view adecrease in the size of the tanks used in the sept1c treatment and anincrease in the speed and effic ency of the treatment, as will now.beexplamed, reference being had to the following specifi- 4 cation andclaims.

The drawing is a vertical section partly in elevation showing two septictanks, a centrifugal separator and piping for convey ng the materialtreated and other detail WhlCh will now'be explained.

Referring to the drawin there is shown an inlet pipe A provided with adeflector B, a tank 0 into which the sewage passes over a travelingscreen D. From the tank 0 the sewage passes through the ipe into thecentrifugal separator H. he pipe E is provided with the admission andregulating Valves F and G. From the centrifugal the material carryingthe bulk of the sol ds passes from the lower portion J and the pipe Iinto the septic tanks N and O, the septic tanks being used alternately.The flow of the material into the tanks N and O is'controlled by thevalves K and L, and the outflow of the liquid from the septic tanks isregulated by suitable valves, not shown. From the centrifugal H theportion that contains only a very slight percentage of solids passesinto a tank P from which it flows out "through the pifie Q. Thecentrifugal is driven by a belt operated by a motor S. To deodorize thematerial during the operation, ozonized air 1s applied. The ozonized airis produced in any of the known ways and passed through the tube T fromwhich it passes through the branch tubes T, T and T into the septictanks and the centrifugal separator so that the operation of treatingthe sewage is carried on without producing any nuisance.

M is a pump by means of which-liquid is carried from the septic tanks Nand 0 through valved pipes U and U and delivered into the tank C throughthe pipe V.

To carry out this process, the bulk of the solids carried by the sewageis first sepaing about 90% rated preferably mechanically as thereby theslow feature of separating solids by settling intanks is avoided. Theseparation may conveniently be effected by means of forced filtration orby means of a centrifugal machine, the separated solid portion carryofwater and sometimes more. The solid portion is then subjected to septicaction in septic tanks, where it becomes liquefied by the action ofanerobic bacteria, which for this purpose need not have a ca-v pacity ofmore than 1% of what is required when the whole volume of the sewage issubected to septic treatment. When the septic action has liquefied thesolid putrescible con-' the filtration, or it may be discharged into themain body of the sewage at the point where the sewage is separated intoportions that are solid or liquid or portions which carry a highpercentage of solid matter and portions which carry a low solid matter.If the liquid is discharged by itself it is preferably subjected to adisinfecting process previous to its discharge such as injection ofozonized air until it is deodorized.

The liquid portion separated may either be immediately discharged inwhich case the slow action of the atmosphere is relied upon for itsdeodorization or it may be treated with a disinfectant such as ozonizedair to deodorize it before being discharged. If the liquid from theseptic treatment is added to the liquid separated by the mechanicaltreatment or to the sewage immediately before the mechanical treatment,the mixture is treated exactly as if the liquid from the septictreatment had not been added.

What I claim as new is:

1. The process of treating sewage which consists in separating sewageinto two parts one containing a high percentage of solids and the othera low percentage of solids, conveying the former to a closed septic tankand there permitting it to be liquefied by the action of anerobicbacteria. Y

2. The process of treating sewage which consists in separatingsewage'into two parts one containing a high percentage of solids and theother a low percentage of solids, conveying the former to a closedseptic tank and permitting it to be liquefied by the acpercentage of,

consists in separating sewage into two parts,

one containing a high percentage of solids and the other a lowpercentage of 'solids, conveying the former to a close septic tank andpermitting it to be liquefied by the action of anerob1c bacteria andconveying the' liquid resulting from the septic action to raw sewageprevious to being subjected to the separative treatment.

4. The process of treating sewage which consists in separating sewageinto two parts, one containing a high percentage of solids and the othera low percentage of solids, conve ing the former to a closed septic tankand t ere permitting it to be liquefied by the action of anerobicbacteria. and subjecting the latter to an oxidizing treatment.

5. The process of treating sewage which consists in separating sewageinto two parts, one containing a high percentage of solids and the othera low percentageof solids, conveying the former to a closed septic tankand there permitting it to be liquefied by the action of aneroblcbacteria and subjecting the latter together with the efiiuent from t theseptic tank to an oxidizing treatment.

6. The process of treating sewage which consists in separating sewageinto two parts, one containing a high percentage of solids and the othera low percentage of solids, conve ingthe former to a closed septic tankand tiiere permitting it to be liquefied by the action of anerobiebacteria, and subjecting the latter together with the efiiuent from theseptic tank to a deodorizingt and disinfecting treatment.

7. 'lhe process of treating sewage which consists in separating sewageinto two parts, one containing a high percentage of solids and the othera. low percenta e of solids, conveying the former to a close septic tankand there permitting it to be liquefied by the action of anerobicbacteria and sub'ecting. the latter together with the efiiuent rom theseptic tank to a deodorizing and d1s1nfecting treatment and subjectingthe gases emanating from the septic tank to a deodorizing anddisinfecting treatment.

Signed at New York in the county of New York and State of N. Y. this15th day of Nov. A. D. 1909.

LYNN T. LEET. Witnesses:

C. A. O. RosnLL, Dona O. ANDERSEN.

